Biden, Warren top latest poll of 2020 Democratic field

Former Vice President Joe BidenJoe Biden2020 Democrats react to 'send her back' chants at Trump rally Can Biden's canceled cancer initiative be salvaged? Biden's health care gaffe shows he's not ready for prime time MORE and Sen. Elizabeth WarrenElizabeth Ann WarrenNew CDC overdose estimates are nothing to celebrate 2020 Democrats react to 'send her back' chants at Trump rally Democratic Houston councilwoman announces Senate bid MORE (D-Mass.) are leading the 2020 Democratic presidential field, according to a poll released Thursday.

The NBC News/Wall Street Journal survey found that 26 percent of likely primary voters support Biden, while 19 percent support Warren. Trailing those two are Sens. Kamala HarrisKamala Devi Harris2020 Democrats react to 'send her back' chants at Trump rally Biden's health care gaffe shows he's not ready for prime time The Hill's Morning Report - Trump seizes House impeachment vote to rally GOP MORE (D-Calif.) and Bernie SandersBernie Sanders2020 Democrats react to 'send her back' chants at Trump rally Cardi B posts message of support for Ilhan Omar #IStandWithIlhan trends after crowd at Trump rally chants 'send her back' MORE (I-Vt.), who are each backed by 13 percent. 

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The only other contenders who receive support from more than 1 percent of voters are South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegThe Hill's Morning Report - Trump seizes House impeachment vote to rally GOP 2020 Democrats adapt to changing social media landscape Trump blasts 2020 Dems during campaign rally MORE with 7 percent, former Texas Rep. Beto O'RourkeBeto O'Rourke2020 Democrats react to 'send her back' chants at Trump rally Bullock makes CNN debate stage The Hill's 12:30 Report: Trump digs in ahead of House vote to condemn tweet MORE with 2 percent and former tech executive Andrew YangAndrew Yang2020 Democrats react to 'send her back' chants at Trump rally 2020 Democrats adapt to changing social media landscape Bullock makes CNN debate stage MORE with 2 percent. 

Warren reportedly fares best with self-described liberals and those aged 18 to 49, while Biden is strongest among older Democrats and African Americans.

Respondents were also asked about their second-choice candidate, which Harris led with 14 percent. She was followed by Warren with 13 percent, Sanders with 12 percent and Biden with 10 percent. 

Only 12 percent of Democratic primary voters, however, said they had definitively made up their mind about their choice. 

Researchers surveyed 800 registered voters including 400 Democratic primary voters between July 7 and 9, after the first primary debates. The margin of error on the primary voters is 4.9 percentage points.